Improvement in turning-lathes



PATENTED FEB. 14, 1871.

P- 13. MILES. TURNING LATHE.

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PATENTED FEB. 14,1871,

1?. B. MILES.

TURNING LATHE.

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0 TOP vnzvv SECTION atent diiiiiw FREDERICK B. MILES, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 FERRIS &. MILES, OF SAMEPL'AOE.

Letters Patent No. 111,859, datedFebruary 14, 1871.

IMPROVEMENT IN TURNING-LATHES- The schedule refer ed to in these Letters fatent and making part of the same.

1, rnnunmcu. B. llIILES, of Philadelphia, in the county of Phnadelphia and Slate of Pennsylvania, have invented certain improvements in Turning- Lathes; of which the following is a specification.

This invention relates to enginc-lathcs for turning v metals.

land is alsosaved from any mistakes in compounding near D The ob ect of this invention is to economize time and to simplify the operation of said engine-lathes, as will be hereinafter explained.

Description of the Accompanying Drawing.

Figurefl is aside elevation. Figure '3 is an elevation, showing that end of the machine which is at the left in fig. 1.

Figu '3 is a plan or top view of the shiftingclamp."

Figure 4 is a vertical section of the movable swinging arm.

vFigure 5 is an elevation of same with shifting'- clamp.

Figure 6 is a plan or top view of same.

General Description.

main spindle H, and operated by a belt in the usual manner.

The carriage O is operated automatically. by the lead-screw B, and by hand with any appropriate device, such rack and pinion,&c., all in the usual manner.

So far all these are common to engine-lathes in general, and form no part of my invention, which I will now proceed to describe in detail.

A pinion, I, of anyconvenieut number of teeth,

' which turns freely in the hub of the movable swinging arm .T, is made to slide lengthwise on the main spindle H, which projects beyond the frame of the machine, as seen in figs. l and 3.

This pinion is made to revolve with said spindle by a slot and feather, and drives a spur-wheel, K, which is hung upon a stud on the movable swinging arm J The lead-screw B also projects beyond the frame of the machine, and has upon it certain gear-wheels, q q q q, whose diameters bear a proportionate ratio-to that ofthe pinion I. i

, The movable swinging arm J has, at its upper end, a segmental slot, L, in which plays the head of a bolt, M, that passes through a split clamp, N, on the stud O. The movable swinging arm can, therefore, be placed opposite any one of the groupof gear- ,wheels on the lead-screw B, and, by means of the intermediate spu1-wheel K, the pinion I can be brought in gear with it. Then, as the spindle revolves, driving the pinion" 1, and, through the wheels in contact, the screw B, the carriage will be drawn forward, so as to produce upon the work either a screw-thread or ordinary feed-motion, whose pitch will depend upon the relative diameters of the pinion .I, and the wheel with which it is placed in gear.

It will be readily seen that, by means of the split shifting-clamp N and the bolt M, with its 'nut-handle I, the swinging arm can be held firmly at any point along the stud O, and, by means of thesegmental slot L, can be placed at any angle required to throw the wheels in or out of gear.

When-the operator, therefore, wishes to produce a different feed or cut ascrew of diiferent pitch, it is only necessary for him to slacken the shiftingclamp by unscrewing the nut-handle P; then,'to move the swinging arm J, with its pinion I, opposite the proper wheel on the screw, swing the arm to such an angle that the intermediate spurwheel K will. gear with it, and then screw up the clamp.

Opposite each wheel on the screw a mark made on the stud O, which indicates the exact position for the split clamp, in order to make that wheel gear correctly with the pinion I, and also a number, which expresses the threads per inch, or the degree of feed produced on the article to he.

turned or screwed when that wheel is so placedin out.

the various threads it .is desired the lathe should Another intei'mediate may be added for a lefthand screw, or any otheref the 'usixal devices fo'r reversing the motion may be empioggd that are used on ordinary 'lathes for gusting lefthand screws.

I claim as my imeutiqu- The combination 9f cone-shaft H, gear-wheel I, series of gear-wheels g on screw-shaft; B, with the agijust-eble segmental arm J, carrying the intrme 1 dmte gear K, clampR bolt M, nut-handle P, and.

graduated stud 0; Substantially asand for the pur-' pose described.

. FREDK. B. MILES; Witnesses GEO. GISHEL ERDINE R. P. MOOALL; 

